Also I once saw a tool that fit into the opening of an AN fitting and
cleaned up the face seal surface with either grinding stones or steel
cutting inserts...
Has anyone else seen this? Any idea what it is called?
On Mon, Jan 4, 2016 at 3:45 PM, Paul Breed <paul@xxxxxxxxxx> wrote:
Can yuou OTW Aluminum I thought it was a stainless only operation...
Furnace braze Al tubes might be an interesting option...
On Mon, Jan 4, 2016 at 3:08 PM, Ben Brockert <wikkit@xxxxxxxxx> wrote:
Not to be confused with suborbital tube welding, which is the technical
school equivalent of underwater basket weaving.
(OTW is a neat and highly effective tech, but does require a change in
design process so that there's clearance for the welder. On the one I used
it meant the tube has to be farther from a wall than you could get away
with using a fitting.)
On Monday, January 4, 2016, Norman Yarvin <yarvin@xxxxxxxxxxxx> wrote:
For those who don't recognize that acronym, it's "orbital tube
welding":
http://www.pro-fusiononline.com/pdf/fc-dec99.pdf
On Sun, Jan 03, 2016 at 11:21:00PM -0800, Michael Clive wrote:
Brazed tube to swage fitting (or just all OTW) would be my course ofaction
if weight is a major concern. IIRC, your chamber pressure is low, muchwill
lower than some I have seen, and a braze joint should work fine. You
need to do some home work on the braze compound that you use in thejoint.
You pre-bend the tube, braze it in, then swage on a test fitting. Whenyou
finish the test, you carve the swage fitting off and OTW the engine intothe
place.
You can engineer the accepting port to just take a quick ream in a setup
jig to prep for braze, then oven braze it.
For your application, for production, I think that OTW is going to be
way to go. It has a high set up cost (tens of thousands of dollars), ora
decently high recurring cost by having contractors do it. However, it ismass
the lightest and most leak free connection system possible. Also, for
production, it is the cheapest and easiest. You have all the tubespre-bent
and cut, and just drop them into a jig, then OTW them. Might be able todavid.c.gregory@xxxxxxxxx>
find a contractor that can do the whole system manifold, which I can't
imagine is complicated.
On Sun, Jan 3, 2016 at 5:59 PM, David Gregory <
wrote:use a
Those look to be the Parker/jic version of as1098 fittings. If you
fittings"Teflon seal they work well in cryo applications.
On Jan 3, 2016, at 4:14 PM, Ben Brockert <wikkit@xxxxxxxxx> wrote:
On Tue, Dec 22, 2015 at 10:51 PM, David Gregory
<david.c.gregory@xxxxxxxxx> wrote:
Ben are you talking about as1098 fittings? Aka "nose seal
especially
Parker Triple-Lok 2,
http://ph.parker.com/us/en/triple-lok-2-soft-seal-37-flare-fittings
I'm not sure if they have an AS spec. The addition of the elastomer
might make it possible for as-built surface finish to seal,
if you design the gland to have a higher fill percentage than usual,
at the cost of replacing the seals every time it's disassembled.
